Analiza merjenja momenta trenja v radialnem hidrodinamičnem drsnem ležaju na namenskem preizkuševališču

zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program

Borut Božic (Author), Simon Oman (Mentor), Marko Nagode (Co-mentor)

Abstract

V zaključni nalogi smo se ukvarjali z merjenjem trenja v hidrodinamičnih drsnih ležajih. Izvedli smo teoretični preračun, ki smo ga potem primerjali z eksperimentalnimi rezultati dobljenimi preko meritev na obstoječem laboratorijskem preizkuševališču. Prve meritve so pokazale signifikantno odstopanje analitičnih in eksperimentalnih rezultatov, zaradi cesar je bila opravljena poglobljena analiza merjenja koeficienta trenja na preizkuševališču. Zaradi načina merjenja, izmerjene vrednosti niso bile natančne in je bilo preizkuševališče potrebno obsežneje predelali, kar je opisano v tem zaključnem delu. Hkrati so v delu opisane tudi nekatere bistvene težave, s katerimi smo se soočali tekom dodelave. Izvedli smo tudi primerjave med starimi in novimi eksperimentalnimi meritvami. Glede na rezultate lahko rečemo, da je novi način merjenja koeficienta trenja bistveno bolj ustrezen, saj zagotavlja veliko ponovljivost meritev, vrednosti pa se v področju hidrodinamičnega mazanja zelo dobro ujemajo z analitično določenimi. Točka prehoda iz hidrodinamičnega (tekočinskega) v mešano trenje je s pomočjo novih meritev lahko določljiva, kar je bil naš osrednji cilj.

Keywords

diplomske naloge;drsni ležaji;hidrodinamično mazanje;moment trenja;koeficient trenja;preizkuševališče;obratovalni režimi;

Data

Language:	Slovenian
Year of publishing:	2023
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[B. Božič]
UDC:	621.822.1:621.89:531.44(043.2)
COBISS:	163484163
Views:	95
Downloads:	19
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Analysis of frictional moment measurement in a radial hydrodynamic journal bearing on a dedicated test rig
Secondary abstract:	In the final assignment, we focused on measuring friction in hydrodynamic journal bearings. We performed a theoretical calculation, which was then compared to experimental results obtained through measurements on an existing laboratory test rig. The initial measurements showed a significant deviation between the analytical and experimental results, leading to an in-depth analysis of the friction coefficient measurement on the test rig. Due to the measurement method, the recorded values were not precise, and extensive modifications were necessary on the test rig, as described in this final work. Additionally, the paper also describes some essential challenges we encountered during the modifications. We also conducted comparisons between the old and new experimental measurements. Based on the results, it can be stated that the new method of measuring the friction coefficient is significantly more suitable as it ensures high repeatability of measurements, and the values align well with the analytically determined ones in the realm of hydrodynamic lubrication. The transition point from hydrodynamic to mixed friction can be determined with the help of new measurements, which was our main goal.
Secondary keywords:	thesis;journal bearing;hydrodynamic lubrication;moment of friction;coefficient of friction;test rig;operating regimes;
Type (COBISS):	Final paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XI, 41 f.
ID:	19896625